酸性气体膜吸收过程中浓差极化  

Concentration Polarization of Membrane Absorption Process of Acidic Gases

作　　者：张卫东[1] 高坚[1] 史季芬[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《过程工程学报》2003年第4期308-312,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金(编号:20206002);北京市科技新星计划资助项目(编号:H013610250112);高等学校博士学科点专项科研资金资助(编号:20020010004);教育部科学技术研究重点项目资助(编号:重点01025)

摘　　要：用聚丙烯中空纤维膜吸收器,针对酸性气体膜吸收传质过程,根据浓差极化时存在局部高浓度区的特点,分别进行了SO_2/空气混合气和CO_2/空气混合气中酸性气体的选择性吸收实验。实验测定了SO_2和CO_2两种不同酸性气体在不同浓度吸收液及不同液速下的总传质系数,比较了两种酸性气体在液相侧的传质特性,根据两组份间化学反应机理的不同,分析了浓差极化对膜吸收过程的影响。A special reaction system was proposed to investigate the mechanism of the mass transfer process in membrane absorption process. The mass transfer resistance of this process was calculated by using hydrophobic PP hollow fiber, for either SO2/air-NaOH system or CO2/air-NaOH system. Different phenomena in these two systems were discussed. Since the reaction mechanism of SO2-NaOH system and CO2-NaOH system is different, SO2 and CO2 mass transfer in solution side is different. The diffusion of different ions and the concentration polarization in liquid phase boundary layer, instead of the ionization effect, was the reason of deviation in SO2 absorption process. The influences of liquid phase velocity and the concentration of absorbent were discussed in this study.

关 键 词：酸性气体 膜吸收 浓差极化 总传质阻力 聚丙烯中空纤维膜吸收器 

分 类 号：TQ028.8[化学工程]